It happens... My doctor said pregnancy is a lot like menopause.. so some of us don't get as lubricated down there.. and it can cause your vagina to feel a little swollen or painful after sex too..
This actually haopened to me when i was in my first trimester. I hated it. I just dealt with it. And used lotions on mu skin constantly . But for sex i wasn't really in the mood i was always moody so i feel bad fo my boyfriend. Lol but it went away now im 21 weeks. Just my tummy is killing me like itchy ugh.
Not only "old" couples use lube..
It hasnt happened to me during pregnancy but it did when i got on the depo shot, use water based lube, happy encounters ;)!